remove exceptions
move preproccessing to transformer
Avoid having temp files for preprocessing

preprocessing output (json-ld) is no longer storred as local temp file.
It returns a string that is passed to the ontology manager to read
input to a  model.
Avoid storing postprocessing locally

Postprocessing is no longer storred as temporary file.
MM output is now a Sting
remove unused temp variables

temp variables for storing output of preprocessing and postprocessing are
no longer used
add test

added folder testData/preferences that will include all test input
added folder testData/configurations that will include all test output
changed the current test to load input and output from files
Note: the test still failes as the assert isn`t true. Input and output are
semantically identical but not in terms of the order what causes the
problem